Official slot machines are casino games that are licensed from a popular television series or movie. The first coin-operated machines were invented in the 1800s and were popular in San Francisco during the Gold Rush. The mechanic Charles Fey is credited with the invention of the ‘official slot machine’. The slot machine combines the themes of the movie and the television series.

Slot machines can be played with cash or paper tickets with barcodes. The lever or button activates the reels, and winning combinations earn credits according to a paytable. The symbols used vary depending on the theme of the slot machine, and can range from traditional fruit symbols to stylized lucky sevens. Many slot machines have a theme that ties into the casino’s business model, and the bonus features align with the theme.